What are microsporogenesis and megasporogenesis?

Microsporogenesis

  • It is the process of formation of microspore from PMC (Pollen Mother Cells).

  • As development occurs in the anther, the sporogenous tissue undergoes meiosis to form microspore tetrad.
  • Each cell of sporogenous tissue has capacity to give rise to a tetrad. Hence, each cell is a potential pollen or PMC.

  • As the anther matures, the microspores get detached from each other and develop into pollen grains.

Megasporogenesis

  • Megasporogenesis is the process of formation of megaspores in the angiosperms.
  • The megaspore mother cell (MMC) gets converted into megaspores by the process of megasporogenesis.

  • The MMC is large and contains a dense cytoplasm and a prominent nucleus. It undergoes meiosis to produce four  megaspores.

  • In most flowering plants, only one megaspore is functional while the other three degenerate.

  • The single functional megaspore develops into the female gametophyte. 

 

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microsporogenesis:-The formation of microspores inside the microsporangia (or pollen sacs) of seed plants. A diploid cell in the microsporangium, called a microsporocyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores. Each microspore then develops into a pollen grain (the microgametophyte)

megasporogenesis:-The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives.

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